dart2js cps: Track existence of try statements in resolution instead of traversing AST/IR nodes to …

pkg/compiler/lib/src/ssa/builder.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of ssa;
 
 class SsaFunctionCompiler implements FunctionCompiler {
   final SsaCodeGeneratorTask generator;
   final SsaBuilderTask builder;
   final SsaOptimizerTask optimizer;
@@ skipping 8431 matching lines @@
   final bool allowLoops;
 
   InlineWeeder(this.maxInliningNodes,
                this.useMaxInliningNodes,
                this.allowLoops);
 
   static bool canBeInlined(FunctionElement function,
                            int maxInliningNodes,
                            bool useMaxInliningNodes,
                            {bool allowLoops: false}) {
+    if (function.resolvedAst.elements.containsTryStatement) return false;
+
     InlineWeeder weeder =
         new InlineWeeder(maxInliningNodes, useMaxInliningNodes, allowLoops);
     ast.FunctionExpression functionExpression = function.node;
     weeder.visit(functionExpression.initializers);
     weeder.visit(functionExpression.body);
     weeder.visit(functionExpression.asyncModifier);
     return !weeder.tooDifficult;
   }
 
   bool registerNode() {
@@ skipping 62 matching lines @@
     if (!registerNode()) return;
     if (seenReturn
         || identical(node.beginToken.stringValue, 'native')) {
       tooDifficult = true;
       return;
     }
     node.visitChildren(this);
     seenReturn = true;
   }
 
-  void visitTryStatement(ast.Node node) {
-    if (!registerNode()) return;
-    tooDifficult = true;
-  }
-
   void visitThrow(ast.Throw node) {
     if (!registerNode()) return;
     // For now, we don't want to handle throw after a return even if
     // it is in an "if".
     if (seenReturn) {
       tooDifficult = true;
     } else {
       node.visitChildren(this);
     }
   }
@@ skipping 377 matching lines @@
     if (unaliased is TypedefType) throw 'unable to unalias $type';
     unaliased.accept(this, builder);
   }
 
   void visitDynamicType(DynamicType type, SsaBuilder builder) {
     JavaScriptBackend backend = builder.compiler.backend;
     ClassElement cls = backend.findHelper('DynamicRuntimeType');
     builder.push(new HDynamicType(type, new TypeMask.exact(cls, classWorld)));
   }
 }